When Donald Trump finished the first official rally of his re-election campaign this week, he got on Air Force One. But he didn't go home to Washington. Instead, he flew 190 miles in the opposite direction – to visit his own Doral golf resort, outside Miami. It would be his 126th visit to one of his properties since taking office. And this visit – like more than a dozen before it – would bring paying customers, allowing Mr Trump to play a double role.